Customer dissatisfaction on a claim.

My father bought a new Isuzu bakkie in Dec 2017 and it was involved in an accident in late July 2018, in August was when he recieved his last written correspondence from MiWay stating that his claim would be processed within 10 working days and nothing there after was communicated in writing. He first recieved a call informing him that the accident was due to failed breaks and when he informed the agent that the vehicle was from service as per the service requirements he then was called again to say the vehicle was not road worthy. He asked MiWay to contact the Isuzu dealership as the vehicle was from service, that was the last he heard from a MiWay Consultant. A Sms regarding Natis request were sent on the 22/08/2018 yet the claim was not approved as per what was communicated with my father. MiWay has a bad claim history because upon a natural disaster where heavy hail rain damaged our property MiWay declined though the cause of the collapse was a storm/ natural disaster. I write on behalf of my father to Express his ans well as our dissatisfaction. The bank is requiring the vehicle's installment and serving him notice documents highlighting breach of contract on his side as he is now unable to make repayments due to MiWay's incompetence in concluding and fulfilling there end as the insurance company involved. Kindly advise and assist.